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Creamy Chicken Thigh Casserole with Mushrooms and Vegetables Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.9 from 351 reviews
  • Author: Julia
  • Prep Time: 10 minutes
  • Cook Time: 6 hours 20 minutes
  • Total Time: 6 hours 30 minutes
  • Yield: 4 servings
  • Category: Casserole
  • Method: Slow Cooking
  • Cuisine: British

Description

This comforting chicken casserole combines tender boneless chicken thighs slow-cooked with mushrooms, carrots, celery, and a richly flavored creamy sauce. Perfect for a hearty family meal, it features a beautifully balanced blend of herbs and spices and is ideal served with mashed potatoes and green beans.


Ingredients

Units Scale

Protein and Fats

  • 2 tbsp vegetable oil
  • 8 boneless chicken thighs, trimmed of fat
  • 2 tbsp unsalted butter
  • 60 ml (1/4 cup) double (heavy) cream

Vegetables

  • 2 brown onions, peeled and diced
  • 3 cloves garlic, peeled and minced
  • 16-20 baby chestnut mushrooms
  • 16-20 chantenay carrots
  • 3 sticks celery, roughly chopped
  • small bunch parsley, chopped

Dry Ingredients and Seasonings

  • 3 tbsp plain (all-purpose) flour
  • 1 tsp salt
  • 1 tsp black pepper
  • 1 tsp dried thyme
  • 1/2 tsp celery salt

Liquids

  • 480 ml (2 cups) chicken stock
  • 1 tbsp freshly squeezed lemon juice

Instructions

  1. Prep and Brown Chicken: Heat the vegetable oil in a large frying pan over medium-high heat. Add the boneless chicken thighs and brown lightly on both sides, which should take about 5 minutes. Remove the chicken from the pan and place it into the slow cooker.
  2. Sauté Onions and Garlic: Add unsalted butter to the frying pan and heat until melted. Add diced onions and cook for 5 minutes, stirring occasionally, until softened. Add minced garlic, stirring and cooking for another minute to release the flavors.
  3. Create the Sauce Base: Sprinkle in the flour, salt, black pepper, dried thyme, and celery salt. Stir and cook the mixture for 2 minutes to form a roux and meld the spices together.
  4. Add Liquids and Boil: Pour in the chicken stock and freshly squeezed lemon juice. Stir continuously and bring the mixture to a boil, allowing it to thicken slightly. Once boiling, carefully pour the sauce over the chicken in the slow cooker.
  5. Add Vegetables: Add baby chestnut mushrooms, chantenay carrots, and roughly chopped celery to the slow cooker. Stir to combine all ingredients evenly.
  6. Slow Cook: Cover with the lid and cook on low heat for 5-6 hours or on high heat for 3-4 hours until the chicken is fully cooked and the vegetables are tender.
  7. Finish with Cream and Serve: Once cooked, shred the chicken slightly using two forks, then stir in the double (heavy) cream to add richness. Serve hot with a garnish of fresh chopped parsley. This dish pairs wonderfully with mashed potatoes and green beans.

Notes

  • You can make this dish ahead of time, then cool, cover, and refrigerate for up to 2 days. Reheat in a large saucepan over medium heat for 10-15 minutes until heated through, adding a splash of cream or milk if needed to loosen the sauce.
  • For freezing, make the casserole, cool, cover, and freeze. Defrost thoroughly in the refrigerator. Reheat in a saucepan on medium heat for 10-15 minutes until hot throughout. This also applies to leftovers.
  • Chicken thighs are preferred for tenderness and shredding, but you can substitute chicken breasts or bone-in pieces.
  • Extra vegetables like baby potatoes, leeks, shallots, or cubes of butternut squash can be added for variety.
  • For extra flavor, add crispy bacon or pancetta at the end of cooking.
  • The recipe scales easily: double all ingredients to increase servings or halve chicken and vegetables for smaller portions, keeping liquid amounts the same to avoid drying out.
  • Oven method: Cook in a covered casserole dish at 175°C (350°F) for 45-60 minutes until carrots are tender. Add an extra 120 ml (1/2 cup) chicken stock to account for evaporation. Stir occasionally during cooking.

Nutrition

  • Serving Size: 1 serving (approximately 1/4 of casserole)
  • Calories: 422 kcal
  • Sugar: 7 g
  • Sodium: 1597 mg
  • Fat: 25 g
  • Saturated Fat: 14 g
  • Unsaturated Fat: 11 g
  • Trans Fat: 0 g
  • Carbohydrates: 19 g
  • Fiber: 3 g
  • Protein: 32 g
  • Cholesterol: 172 mg